一个Unity变焦脚本

[Unity] Camera Zoom Script Showcase

https://www.youtube.com/watch?v=SgdVi4S9OjQ

脚本简介 / Overview

1. It controls the camera for Third Person Controller.

2. It uses LeanTween to animate the camera's FOV and distance to player.

3. It has functions for zooming in, zooming out, and zooming in response to mouse scroll wheel input.

4. The Update function checks for keyboard and mouse input to determine when to start or stop zooming. The ZoomIn, ZoomOut, and ZoomToDefault functions use LeanTween to smoothly transition the camera's field of view and default distance between the current values and the target values over a specified duration.

5. 以上 4 条是 ChatGPT 帮我写的。

使用方法 / Usage

1. Attach the script to the “vThirdPersonCamera” gameobject, and tune its parameters.

2. For reference, here are the default values I set:

代码本体 / Script

using UnityEngine;

public class CameraZoom : MonoBehaviour
{
    [Header("FOV")] 
    public float fovRange = 8f;
    public float fovDelta = 4f;

    [Header("Camera Distance")] 
    public float distanceRange = 0.25f;
    public float distanceDelta = 0.2f;

    [Header("Factors")] 
    public float zoomDuration = 0.3f;
    public float zoomInFactor = 1.5f;
    public float rightOffsetFactor = 0.3f;
    public float scrollFactor = 0.025f;

    private vThirdPersonCamera cam;
    private float FOV, FOVmin, FOVmax, FOVdefault, tempFOV, tempDistance, defaultDistance, defaultRightOffset;

    private void Start()
    {
        cam = GetComponent<vThirdPersonCamera>();
        defaultDistance = cam.defaultDistance;
        tempDistance = defaultDistance;
        defaultRightOffset = cam.rightOffset;

        FOV = GetComponent<Camera>().fieldOfView;
        FOVdefault = FOV;
        tempFOV = FOV;
        SetMinMax();
    }

    private void Update()
    {
        if (Input.GetKey(KeyCode.W) || Input.GetKey(KeyCode.A) || Input.GetKey(KeyCode.S) || Input.GetKey(KeyCode.D))
            if (Input.GetKeyDown(KeyCode.LeftShift))
                ZoomOut();

        if (Input.GetKeyUp(KeyCode.LeftShift))
            ZoomToDefault();

        if (Input.GetMouseButtonDown(1))
            ZoomIn();

        if (Input.GetMouseButtonUp(1))
            ZoomToDefault();

        if (Input.mouseScrollDelta.y != 0)
            ZoomOnMouseScroll();
    }

    private void ZoomIn()
    {
        tempFOV = FOV;
        FOVmin -= fovDelta * 2f;

        LeanTween.value(FOV, FOV - fovDelta * 2f, zoomDuration * zoomInFactor).setOnUpdate(val =>
        {
            FOV = val;
            GetComponent<Camera>().fieldOfView = FOV;
        });

        LeanTween.value(tempDistance, tempDistance - distanceDelta * 1.75f, zoomDuration * zoomInFactor).setOnUpdate(val => { cam.defaultDistance = val; });

        LeanTween.value(defaultRightOffset, defaultRightOffset + distanceDelta * rightOffsetFactor, zoomDuration * zoomInFactor).setOnUpdate(val => { cam.rightOffset = val; });
    }

    private void ZoomOut()
    {
        tempFOV = FOV;
        FOVmax += fovDelta;

        LeanTween.value(FOV, FOV + fovDelta, zoomDuration).setOnUpdate(val =>
        {
            FOV = val;
            GetComponent<Camera>().fieldOfView = FOV;
        });

        LeanTween.value(tempDistance, tempDistance - distanceDelta, zoomDuration).setOnUpdate(val => { cam.defaultDistance = val; });
    }

    private void ZoomToDefault()
    {
        LeanTween.value(FOV, tempFOV, zoomDuration).setOnUpdate(val =>
        {
            FOV = val;
            GetComponent<Camera>().fieldOfView = FOV;
        });

        LeanTween.value(cam.defaultDistance, tempDistance, zoomDuration).setOnUpdate(val => { cam.defaultDistance = val; });

        LeanTween.value(cam.rightOffset, defaultRightOffset, zoomDuration).setOnUpdate(val => { cam.rightOffset = val; });

        SetMinMax();
    }

    private void ZoomOnMouseScroll()
    {
        float scrollDelta = Input.mouseScrollDelta.y;

        tempDistance -= scrollDelta * scrollFactor;
        tempDistance = Mathf.Clamp(tempDistance, defaultDistance - distanceRange, defaultDistance + distanceRange);
        cam.defaultDistance = tempDistance;

        FOV -= scrollDelta * scrollFactor * 20;
        FOV = Mathf.Clamp(FOV, FOVmin, FOVmax);
        GetComponent<Camera>().fieldOfView = FOV;
    }

    private void SetMinMax()
    {
        FOVmax = FOVdefault + fovRange;
        FOVmin = FOVdefault - fovRange * 0.75f;
    }
}